Whirlpool bathtub



FIG. 1 is a top perspective view of a whirlpool bathtub showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is an elevational view thereof taken from the side opposite that shown in FIG. 3;

FIG. 5 is an end elevational view thereof; and,

FIG. 6 is a elevational view thereof taken from the end opposite that shown in FIG. 5. 

The ornamental design for a whirlpool bathtub, as shown and described. 